The Harz National Park is a nature reserve in the German federal states of Lower Saxony and Saxony-Anhalt. It comprises large portions of the western Harz mountain range, extending from Herzberg and Bad Lauterberg at the southern edge to Bad Harzburg and Ilsenburg on the northern slopes. 95 % of the area is covered with forests, mainly with spruce and beech woods, including several bogs, granite rocks and creeks. The park is part of the Natura 2000 network of the European Union.
In its current form, the park was created on January 1, 2006 by the merger of the Harz National Park in Lower Saxony, established in 1994, and the Upper Harz National Park in Saxony-Anhalt, established in 1990. As the former inner German border ran through the Harz, large parts of the range were prohibited areas, that apart from the fortifications had remained completely unaffected for decades. Today the park covers parts of the districts of Goslar, Osterode and Harz.